*{
    margin: 0;
    padding: 0;
}
body{
    background: rgb(247, 247, 247);
    background: url('../Res/img/sky.jpg');
    transform-style: preserve-3d;
    perspective: 600px;
    -webkit-perspective: 600px;
}
#fanz{
    width: 350px;
    height: 400px;
    position: absolute;
    top: calc(50% - 200px);
    left: calc(50% - 175px);
    border: 1px solid black;
    /* overflow: hidden; */
}
.form_box{
    /* border: 1px solid black; */
    width: 100%;
    height: 100%;
    border-radius: 25px;
    background: #fff;
    text-align: center;
    padding: 30px 20px;
    box-sizing: border-box;
    transition: all 0.5s linear;
    opacity: 0.7;
    
    backface-visibility: hidden;
    /* transform-style: preserve-3d;
    perspective: 600px;
    -webkit-perspective: 600px; */
}
.login_m{
    transform: rotateY(0deg);
    transform-style: preserve-3d;
    perspective: 600px;
    -webkit-perspective: 600px;
}
.login_m:hover{

}
.login_m:hover input{

}
.sign_in_m{
    transform: rotateY(180deg);
    perspective: 600;
    -webkit-perspective: 600;
}
.form_box:hover{
    box-shadow: 3px 3px 30px rgba(157, 139, 185, 0.3);
    opacity: 1;
}
.form_box form{
    perspective: 1000px;
    transform-style: preserve-3d;
    transform:translateZ(60px) scale(0.94);
}
.form_box form h1{
    font: 900 40px/1em 'Arial Rounded MT';
}
.form_box form input:first-of-type{
    margin-top: 100px;
}
.form_box form input{
    display: block;
    border: 0;
    border-bottom: 1px solid rgb(68, 68, 68);
    width: 250px;
    height: 30px;
    margin: 30px auto;
    outline:none;
    font-size: 15px;
    font-family: 'Arial Rounded MT',宋体;
    letter-spacing: 2px;
}

.form_box form input:last-of-type{
    width: 150px;
    height: 45px;
    /* border: 1px solid rgb(68, 68, 68); */
    border-radius: 15px;
    background: rgba(221, 207, 222, 0.562);
    font-size: 20px;
    font-family: 隶书;
    letter-spacing: 0px;
    margin-top: 40px;
}
.form_box form input:last-of-type:hover{
    background: rgb(221,207,222);
}
.form_box span{ 
    font:500 20px/1em 隶书;
    float: right;
    margin-right: 25px;
    margin-top: -10px;
    cursor: pointer;
    overflow: hidden;
}
.form_box span:before{
    content: '';
    width: 0px;
    height: 0px;
    border: 5px solid transparent;
    border-left-color: rgb(63, 62, 62);
    float: left;
    margin-top: 5px;
}
.form_box span:hover{
    color: rgb(221,207,222);
}
.form_box span:hover:before{
    border-left-color: rgb(221,207,222);
}